12-7
IM 760201-01E
RGB V
ideo Signal (VGA) Output (Optional) and Other Features
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App
Index
Explanation
The measurement of two WT500s can be synchronized by making one WT500 the
master and the other WT500 the slave. The master outputs a measurement start signal,
and the slave receives the signal.
External Start Signal Input/Output Connector
Connect the rear panel EXT CLK connectors between the master and slave instruments
using a BNC cable (sold separately).
EXT. CLK
Item
Specification
Note
Connector
BNC connector
Same for both master and slave
I/O level
TTL
Same for both master and slave
Output logic
(negative logic), falling edge Applies to the master
Measurement start delay time within (1
µ
s + sample interval)
Applies to the master
Output hold time
Low level, 500 ns or more
Applies to the master
Input logic
(negative logic), falling edge Applies to the slave
Minimum pulse width
Low level, 500 ns or more
Applies to the slave
Input delay time
When the display is held
Applies to the slave
within (1
µ
s + sample interval)
When the display is not held
Applies to the slave
within (63 ns + sample interval)
Note
The measurement of the master and slave cannot be synchronized under the following
conditions:
• When the data update rate differs between the master and slave.
• During real-time integration mode or real-time store mode.
Follow the procedure below to hold the display during synchronized measurement.
• To hold the display: Hold the display of the master first.
• To un-hold the display: Un-hold the display of the slave first.
• When the synchronized measurement setting is set to slave, you cannot set the
synchronization source (see section 4.7 for details), PLL source (see section 6.3 for details),
or trigger source (see section 7.5 for details) Ext Clk setting, because all of these settings
use the same connectors.
• To connect a BNC cable to the external clock input/external start signal output connector
(EXT CLK) when a GP-IB cable is connected to the GP-IB connector, first remove the GP-IB
cable. Then connect the BNC cable. Finally, reconnect the GP-IB cable.
12.6 Master and Slave Synchronized Measurement
